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CVE-2026-96940 is an authorization weakness in Microsoft Exchange Server that allows an authenticated attacker to elevate privileges over a network. Successful exploitation can expose other users' mailboxes, including email messages and attachments, within the same organization, but does not permit access across tenant boundaries. Affected releases include Exchange Server 2016 CU23, Exchange Server 2019 CU14 and CU15, and Exchange Server Subscription Edition RTM. The specific vulnerable function and technical exploitation mechanism are not identified.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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95 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An elevation-of-privilege vulnerability affecting all supported on-premises versions of Microsoft Exchange Server, rated CVSS 8.8. The report describes its potential use as a follow-on step after an initial compromise to gain control of the mail system. Microsoft assesses exploitation as more likely, but the report states that no public exploitation has been confirmed.
A high-severity elevation-of-privilege vulnerability in Microsoft Exchange Server caused by weak authorization, with a reported CVSS score of 8.8. An attacker with valid authentication could bypass mailbox access restrictions and read other users’ emails and attachments within the same organization; cross-tenant access is not possible. Microsoft disclosed the flaw on October 2, 2026, and considers exploitation more likely, although no active exploitation had been observed as of October 6, 2026.
A high-severity authorization vulnerability in Microsoft Exchange Server, rated CVSS 8.8, allows authenticated attackers to gain elevated privileges and read other users' email messages and attachments within the same organization. It does not permit access across tenant boundaries. Microsoft considers exploitation more likely, but the article does not report observed exploitation. Security updates are available for affected on-premises versions, and Exchange Online has already been fixed.
An elevation-of-privilege vulnerability in Microsoft Exchange Server allows an authenticated attacker to cross mailbox access boundaries and access other users' emails, attachments, and sensitive mailbox information within the same Exchange organization. It does not provide cross-tenant access. Microsoft discovered the issue internally and issued an out-of-band fix, recommending prompt installation of the latest applicable V2 security update. Microsoft reports no known active exploitation.
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Cross-references every affected SKU, including bundled OEM variants.
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